JPS62187067A - Method for positioning image - Google Patents

Abstract

PURPOSE:To easily prevent the positional shift of a continuous form paper in printing said paper, by setting the position of an image from an exposure process to a photoengraving process on the basis of the second register pin of a plate cylinder and inserting the second register pin of the plate cylinder in the positioning hole of a printing plate. CONSTITUTION:An image is inputted by an image input means and this image data is delivered to an image photosensitive apparatus 1. Next, the image exposing position to a film is set by a coordinates position setting means. Subsequently, first register pins 3 are inserted in the positioning holes 5 of the film within the image photosensitive apparatus 1 and the image is exposed to the above- mentioned indicated position by an exposing apparatus. Next, the positioning holes 11 having the same measure as the positioning holes 5 of the film drilled in a printing plate 10b are allowed to mutually coincide with the positioning holes 5 and intermediate register pins 12 are inserted in the holes 5, 11 to perform the positional matching of both of them. The printing plate 10b is positioned by inserting the second register pins 24 formed to a plate cylinder 20 of which positional relation to the image is the same as that of the first register pins 3 in the positioning holes 11 of said printing plate 10b.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention exposes an image input from a single image input means onto a film using a single image photosensitive device, and prints the image using a printing plate made from the developed film. The present invention relates to an image positioning method for accurately positioning an image with respect to a printing paper in a method of printing on a required printing paper.

<Prior art> In the conventional printing process, when the printing plate is attached to the plate cylinder, the position of the printing plate is moved or the printing machine is adjusted so that the image is evenly printed on the predetermined position on the printing paper. do,
This required a work process called matching.

<Problems to be Solved by the Invention> Recently, there has been a rapid increase in the demand for printing business forms in which images of the same pattern are continuously printed on long printing paper. Even if the positional deviation is minute, the positional error accumulates, resulting in a large positional deviation. If there is a positional shift like this, the perforations for cutting that will be drilled later and the first
Printing defects occur due to inconsistency in the relationship with the image. For this reason, extremely high precision has come to be required for the registration. However, this registration method relies on a cross-shaped register mark (marker) and is adjusted visually, which is troublesome, prone to errors, and has the drawback of requiring readjustment several times. Ta.

An object of the present invention is to provide an image positioning method that can eliminate the above-mentioned conventional drawbacks.

Means for Solving Problems> The present invention exposes an image input from an image input means onto a film using a single-image photosensitive device, and prints the image onto a required printing paper using a printing plate made from the developed film. In the printing method, the image position is determined by the following steps.

What is a printing plate made from developed film?

This also includes cases where the developed film is used as it is as a printing plate.

(2) The coordinate position setting means specifies the image exposure position on the film with reference to the first register pin.

(2) The exposure device exposes the image input from the image input means onto the film, which is held in position by inserting the first register pin into the positioning hole, at the designated position from the coordinate position setting means.

■) If there is a transfer process in the process from the developed film to the printing plate, the alignment between the two materials is determined by positioning an intermediate register pin that has the same positional relationship as the first register pin for one image. This is done by inserting it into the predetermined hole.

IV) The positional relationship with respect to the image is the same as that of the first register pin. A second register pin disposed at a predetermined position on the plate cylinder of the printing press is inserted into a positioning hole in the printing plate to fix the position of the printing plate.

Function> First, the image reading device 91. An image is input by an image input means such as a key switch input device using a CRT screen. Such input data is passed to the image sensing device.

Next, the coordinate position setting means is used to set the image exposure position on the film. This setting is made by numerically inputting the distance from the reference position or by selecting a preset pattern. (Step E) In the image photosensitive device, a first register pin is inserted into a positioning hole in the film to maintain its position. The positioning hole is formed using a register pin as a punching tool,
The film positioned by the register pins, which may be formed at the same time as the film is inserted, is exposed to an image input from the image input means by the exposure device at the designated position from the coordinate position setting means. Therefore, the position of the image is a position specified with respect to the positioning hole (first register pin) of the film.

(Step ■) Next, after developing the film, a printing plate is usually made from the film. In this case, positioning holes having the same specifications as the positioning holes of the film are drilled in the printing plate, the positioning holes are aligned with each other, and intermediate register pins are inserted to align the two. (Step II I) When transferring the film to another material and then forming a printing plate using the material, insert an intermediate register pin in the positioning hole, which has the same positional relationship with the image as the first register pin, as described above. Insert it.

Recently, in order to cope with printing in a wide variety of small quantities, a film plate material (for example, Mitsubishi Silver Mask), which uses the film itself as a printing plate, has been developed.

Therefore, when using such a film plate material, the above-mentioned alignment step is not required.

The printing plate manufactured in the above process is positioned by inserting a second register pin formed on the first printing cylinder, which has the same positional relationship with the image as the first register pin, into the positioning hole. (Step III) Therefore, in the process from the image exposure process of the film to the mounting of the printing plate on the plate cylinder, each position is aligned using the valley register pins that have the same positional relationship with the image. The image will be positioned in a predetermined position on the first plate cylinder without the need for registration.

<Example> An embodiment of the invention will now be described with reference to the accompanying drawings.

As shown in FIG. 1, an image is first input using image input means such as an image reading device or a key switch input device using a C81 screen. Such input data is input via a floppy disk or directly online to the central control unit 2tcPU of the image-sensing device l and stored in the storage device lRA.
Stored in M.

Next, various printing formats are specified using the keyboard constituting the coordinate position setting means.

In other words, a) Film material selection port) Selection of whether the output image is positive or negative c) Selection of whether the output image is a normal image or a reverse image 2) Coordinate position relative to the register pin Settings etc. are made.

Next, in the one-image photosensitive device 1, as shown in FIG. 2, the film f is supplied from the film loader C to the loading table 2. After the film f is temporarily fixed at a predetermined position on the mounting platform 2 by means such as vacuum suction, the first register pins 3 arranged in a plurality of position directions are used to form positioning holes 5. It is inserted. As a result, the film f is transferred to the loading platform 2.
It is fixed on the top by a first register pin 3. The position of the first register pins 3 has the same specifications as the second register pins 24 of the plate cylinder 20, which will be described later, with the same number and spacing.

After that, the laser scanner 4 placed on the top
As a result, a predetermined image (2) is exposed on the film f. The exposure position and its mode are determined according to the specified input from the keyboard.

Among these specified inputs, the above-mentioned coordinate position setting 2) is for setting the axial direction of the image I with respect to the film f, and setting the position of the image I on the film f.
This is done with the first register pin 3 as a reference.

That is, first, the axial direction of the film f is designated by the image technician using the keyboard. As shown in FIG. 4, there are various forms of this, such as vertical, horizontal, half-rolled, etc., and is selected in consideration of the intended use of the printed matter, the layout on the paper surface, etc.

Next, the origin 0 of the 0 image ■, which sets the position of the origin 0 of the image processing, is set, for example, to the upper right position of the image. The setting is made based on the position of the bin 3, since the film is positioned on the mounting table by the first register pin 3, and the subsequent alignment of each material is done at this bin position. .

Specifically, as shown in FIG. 3, the position of the origin O of the image I is set to the leftmost first register pin 3 as a reference, and the horizontal and vertical distances X and y from there are input. In reality, the distance x, y is set to the mechanical origin O of the laser scanner 4.
Positioning is achieved by calculating the distance from 0 and performing position setting based on the mechanical origin O.

The position setting can be done not only by numerically inputting the distance from the first register pin 3, but also by selecting a predetermined pattern corresponding to the printing form.

In the image-sensing device 1, the film f to which the image I has been exposed is subjected to development and then subjected to the next plate-making process.

That is, as shown in FIG. 5, the film plate material 10a is formed with a positioning hole 11 that matches the positioning hole 5 formed by the first register pin 3, and the positioning hole 5 and the positioning hole 11 are formed in the film plate material 10a. After aligning and overlapping the images and positioning them by inserting the intermediate register pins 12, the image is transferred, and the film plate material 10a is placed on the printing plate 1.
It becomes 0b. Therefore, the relative position between the image (2) on the printing plate tab and the positioning hole 11 is the same as the relationship between the image I on the film f and the positioning hole 5. Therefore, 1 positioning hole 5 is
Since the first register pin 3 having the same specifications as the second register pin 24 of the plate cylinder 20 is inserted, the position of the first positioning hole 11 is as follows.

This is the same as the insertion position of the second register pin 24.

As shown in FIG. 6, the printing plate lOb has a square width on both sides thereof for engagement with the grooves 21 of the first plate cylinder 20.
3 is formed. Therefore, as shown in FIG.
is inserted into the positioning hole 11 and positioned.

The image I of the printing plate 10b wrapped around the plate cylinder 20 is
From the above-mentioned exposure process to the plate-making process, the second register pin 24 of the plate cylinder 20 is set as a reference and is sequentially transferred, so that its position must be positioned at a predetermined position on the plate cylinder 20. becomes. Therefore, even when printing business forms such as continuous forms, misalignment can be prevented as much as possible.

<Effects of the Invention> As described above, in the present invention, the position of the image (2) is set based on the second register pin of the plate cylinder from the exposure process to the plate-making process. If you insert the second register pin, the image will appear naturally! is positioned at a predetermined position on the plate cylinder. Therefore, even in cases where precise alignment is required, such as when printing continuous forms, it can be easily handled without requiring any skill, and it has excellent effects such as preventing misalignment as much as possible. be.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of the present invention, in which FIG. 1 is a block circuit diagram, FIG. 2 is a schematic side view showing the positioning of the film f in the image-sensing device 1, and FIG. 3 is a diagram showing the positioning state of the film f. 4 is a plan view showing a mode of image processing; FIG. 5 is a schematic side view showing the positioning of the film f and the film plate 10a; FIG. 6 is a plan view of the printing plate 10b;
The figure is a schematic perspective view of a state in which a printing plate fob is attached to a plate cylinder 20. l; Image photosensitive device 3; First register pin 4; Laser scanner 5; Positioning hole lOb; Printing board ll;
Positioning hole 20; plate cylinder 24; second register pin f
;Film I;Image

Claims (1)

[Scope of Claims] A method for exposing an image input from an image input means onto a film using an image-sensing device, and printing the image on a required printing paper using a printing plate made from the developed film, comprising the following steps: An image positioning method consisting of: I) A coordinate position setting means designates the image exposure position on the film with reference to the first register pin. II) The exposure device exposes the image input from the image input means onto the film, which is held in position by inserting the first register pin into the positioning hole, at the designated position from the coordinate position setting means. III) In the process from developed film to printing plate,
If there is a transfer process, alignment between the two materials is performed by inserting an intermediate register pin whose positional relationship with respect to the image is the same as that of the first register pin into the positioning hole. IV) Fixing the position of the printing plate by inserting a second register pin, which has the same positional relationship with the image as the first register pin and is arranged at a predetermined position on the plate cylinder of the printing press, into the positioning hole of the printing plate. do.